test(crates/rocie-server/testenv/init): Automatically choose the port and wait for server start

This avoids issues regarding a race condition between server start and
our start of requests and removes the requirement for specifying free
ports in the test files.

1 files changed, 10 insertions, 2 deletions

diff --git a/crates/rocie-server/src/cli.rs b/crates/rocie-server/src/cli.rs
index b2ec214..80b4292 100644
--- a/crates/rocie-server/src/cli.rs
+++ b/crates/rocie-server/src/cli.rs
@@ -13,8 +13,16 @@ pub(crate) enum Command {
     /// Serve the server.
     Serve {
         /// Which port to serve the server on.
-        #[arg(short, long, default_value = "8080")]
-        port: u16,
+        ///
+        /// Leave empty to let the OS choose a free one.
+        #[arg(short, long)]
+        port: Option<u16>,
+
+        /// Print the used port as single u16 to stdout when started.
+        ///
+        /// This can be used, to determine the used port, when the `port` was left at `None`.
+        #[arg(long)]
+        print_port: bool,
 
         /// Which host to serve the server on.
         #[arg(short = 'b', long, default_value = "127.0.0.1")]